摘要
某超临界660 MW汽轮机的高中压转子频繁发生振动跳变故障,频谱分析表明振动跳变主要表现为半频成分,且振动跳变与机组负荷关联密切,据此诊断故障原因为汽流激振。现场跟踪监测了不同负荷对应的轴承振动变化,对调门开度,主蒸汽参数进行各种优化调整,并对润滑油系统包括各道轴承的油膜压力、轴封汽系统、开展了细致的排查。通过对振动的特征及机理的进一步分析,指出汽流激振力主要来源于密封激振力和叶顶间隙激振力。随后对高压调阀全行程特性进行测试,研究了每一个调阀在全行程内的振动趋势,并依据试验结果对高压调阀的开启顺序进行调整,从几种阀序的实际试验情况中,找到最佳的高压调门开启顺序,成功消除了该振动故障,为类似振动故障的处理提供参考。
The vibration frequent mutation of high and medium pressure rotors of a certain supercritical 660 MW steam turbineoccurred. The frequency spectrum analysis shows that the vibration mutation is mainly represented and the vibration mutation is closely related to the load of the unit. According to the vibration in different load, optimize the vvlveopening and the main stream parameters,examine the bearing oil film pressure and gland steam system,the cause of fault diagnosis issteam-flow exciting vibration. Through the further analysis of the characteristics and mechanismof the vibration,excitation force of the steam flowmainly comes from the exciting force of the seal and full stroke characteristic of the high-pressure governing valve is tested,the vibration trend of every valve is the opening sequence of the high-pressure governing valve is adjusted according to the test results,from the actual situation of severaltest valve sequence,the optimal opening sequence of high pressure governing valve is found,and successfully eliminates the vibrationfault, and provides referencc for similar vibration failure processing.
作者
顾剑
GU Jian(Guizhou Jinyuan Chayuan Power Generation Co. , Ltd. ,Jinsha 551800 Guizhou,Chin)
出处
《电力大数据》
2018年第1期14-17,共4页
Power Systems and Big Data
关键词
汽轮发电机组
高中压转子
汽流激振
振动
turbo-generator units
high and medium pressure rotor
steam-flowexciting vibration
vibration
